The effect of friction to dry gas seal performance can’t be ignored under the condition of high parameter. Based on the structure characteristics of the sealing system and end⁃face, it was established the calculative model of lubricating gas film, used IC⁃EM to divide the grid. Then, conducted numerical simulation to get gas film pressure distribution and velocity distribution by using Fluent software. Finally, it calculated the friction coefficient of lubricating film by the law of Newton internal friction. The result of research shows that the friction coefficient of the lubricating film increases with the increase of the rotational speed, and it decreases with the increase of the medium pressure and the average film thickness in the groove parameters remain unchanged case. When the operating parameters are unchanged, the film friction coefficient increases with the increase of the root diameter, decreases with the increase of the number of grooves and the depth of the groove, and in 75° to 76° spiral angle range is relatively stable.

Nanometer RuO₂ particle were prepared by sol-hydrothermally method using RuCl₃·nH₂O as raw material,and RuO₂ /polyaniline composite were fabricated from aniline polymerization in RuO₂ sol by conventional chemical oxidation.The morphology and microstructure were characterized by SEM and XRD,and its electrochemical properties were investigated with cyclic voltammetry.The results indicate that the structure of the composites vary by different mass fraction of RuO₂.When the mass fraction of RuO₂ is 5%,compact RuO₂ coats are formed on the surface of polyaniline particles,and electrochemical capacitance of the composite diminish due to polyaniline capacitance disappearance.RuO₂ particles are dispersed in the polyaniline when the mass fraction of RuO₂ is more or less than 5%.The capacitance of the composite reaches the maximum is 374.6 F/g when the RuO₂ mass fraction is 3%.The composite with less RuO₂ content has good electrochemical property which is suitable for supercapacitors.